@Roberta,
Yesterday when I was at the pool, I saw a wasp doing just this.
I thought it was amazing, as there were a lot of people in the pool, and it had landed like this in one of the lap lanes.
At first I thought it was in trouble, and got concerned when a lap swimmer came swimming through.
The wasp just fly up about a foot until the swimmer passed, and landed right back down in the same spot.
Wasps really love water, they always go right to it when I refill my bird bath (in this weather every other day)